Why apply_central_impulse is called infinitely on a timer timeout ?

NeoD

I have a ball as a RigidBody2D and if I call this function in _ready() the ball is pushed once as expected. But if I use a timer the behaviour is very different.

func _on_Timer_timeout():
    print("timeout") # Thanks to this print you can see the timeout happens only once.
    $Ball.apply_central_impulse(Vector2(0.0, -100.0))

The ball accelerates infinitely. My limited thinking abilities didn't find the cause.

Lethn

The first thing that springs to mind is somewhere you're not resetting it properly and the game engine thinks the timer is still at zero.

dotted

-100.0 is delta momentum or velocity. Assuming you have a mass of 1 kg, did you intend that?

Also applying forces/impulses should be done from the correct functions or unusual behavior might happen

https://docs.godotengine.org/en/stable/tutorials/physics/rigid_body.html#how-to-control-a-rigid-body https://docs.godotengine.org/en/stable/classes/class_rigidbody.html#method-descriptions https://docs.godotengine.org/en/stable/tutorials/physics/physics_introduction.html#physics-process-callback